"Unforgettable"
  
is a popular song written by Irving Gordon. The
song's original working title was
"Uncomparable". The music publishing
company asked Irving to change it to
"Unforgettable". The song was published in
1951.
The most popular version of the song was
recorded by Nat King Cole in 1951, with an
arrangement written by Nelson Riddle.    
   Nathaniel Adams Coles (March 17, 1919 –
February 15, 1965), known professionally as Nat
"King" Cole, was an American musician who
first came to prominence as a leading jazz
pianist. Although an accomplished pianist, he
owes most of his popular musical fame to his
soft baritone voice, which he used to perform in
big band and jazz genres.
    He was the first black American to host a
television variety show, and has maintained
worldwide popularity since his death; he is
widely considered one of the most important
musical personalities in United States history.
    In 1991, Cole's 1962 recording of the song
was edited and remixed to create a duet with his
daughter, Natalie, which won three awards at the
Grammy Awards of 1992: Song of the Year,
Record of the Year and Best Traditional Pop
Vocal Performance